I have a 1911 holster with a date that so far is unreadable. The manufacturer stamp is Clinton and the inspector initials are C.S. The date looks like it might be 1918, but the last number could be a 3,6 or 9 as only the bottom quarter is showing. Is there a way to identify when it was made from the details (cut, stitching, US mark, etc.)? Thanks for any assistance.